Artificial tooth



F. W. SHAPLEY.

ARTIFICIAL TOOTH.

APPLICATIQN man JUNE-30. I920.

14363,,169, Patented Dec. 21, 1920.

UNITED ST'i'ES PATENT orrucs.

FREDERICK W. SHAPLEY, 0F CANTON, OHIO.

ARTIFICIAL TOOTH.

To all whom it may concern:

Be it known that I, FREDERICK W. Snar- LnY, a citizen of the United States, resldmg at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Artificial Teeth; and I do hereby declare the following to be a full, clear, and exact description of the mvention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of the invention is to provide as an article of manufacture a tooth of the type ordinarily designated as facings but designed equally for use in connectlon w1th plate and bridge work and having means of attachment whereby in repair work a new facing may readily be applied without reinvestment, or in other words to provide an artificial tooth wherein the facings are readily interchangeable to provide for substitution whenever the necessity for-the same may arise, and with these objects 111 vlew, the invention consists in a construction and combination of parts of which a preferred embodiment is shown in the accompanying drawmgs, where1n Figure 1 1s a rear or posterior view of a tooth constructed in accordance with the invention.

Fig. 2 is a longitudinal sectional view of the same.

Fig. 3 is a view similar to Fig. 2 of the tooth facing detached.

Fig. 4 is a detail perspective view of the case detached.

Fig. 5 is a transverse sectional view of the tooth showing the anchoring pin extending in front of the plane of the case to engage a registering impression in the facing.

In the posterior side of the faclng l0 and extending inward from the cervical border thereof is a laterally under-cut or transversely dove-tailed seat 11 in which is fitted a correspondingly shaped case 12 consisting of a rearwardly concaved plate or box from an intermediate portion of the front wall of which projects an anchoring pin or stud 13 having a terminal head 14: to serve as a fastening means to permanently attach the case to the plate or bridge, said pin or stud being suitably cemented or otherwise an chored in the case and extending rearwardly beyond the posterior side of the tooth The cavity of the case is designed to receive ce- Specification of Letters Patent.

Patented Dec. 21, 1920.

Application filed June 30, 1920. Serial No. 393,124.

ment as a key for investing the pin or stud and lnsurmg the stability of the attachment of the casing to-the plate or bridge, said key being indicated at 15.

The case may be baked into the tooth facing or may be separately formed and cemented therein, or as indicated in Fig. *5 the anchoring pin or stud may extend through'an opening 16 in the front wall of the case and project into a depression or socket 17 in the bottom of the seat or recess in the facing, to serve as an additional means (of locking the case and facing in their proper relations.

In the event of fracture of the facing it is obvious that a new facing may be applied to the case which remains attached to the plate or bridge, by sliding the new facmg onto the case, and if the supplemental means of securing the case and facing has been used, consisting as above noted of the forward extension of the anchoring'pin or stud to engage the facing, such projecting terminal may be removed by grinding or filing, to permit of the sliding application of the substitute facing.

The case herein described is designed for use in connection with front teeth, but also can be used and designed for back teeth such as bicuspids and molars and it will be understood that the term cement as employed herein, particularly with reference to employment as a key or filler for the teeth in the investment of the pin or stud, is intended to include any and all cementitious materials as well as artificial denture material well known in the art.

It will also be understood that whereas, as above described, the anchoring pin or stud may be extended through the wall of the case to engage the facing, it may be preferable under certain conditions to terminate the same at the .wall of the case, and under any circumstances when a new facing is to be supplied to replace a broken or cracked facing, the projecting portion of the anchoring pin or stud, located in advance of or projecting beyond the front wall of the case, must be removed in order to permit of sliding the new facing into position. Registering openings in the mesial and distal walls of tooth and case as shown at 18 are for denture material to run in and lock tooth to the case.

The use of these registering openings in the walls of the tooth and the case may be either in lieu of or supplemental to the anchoring means consisting as above described in the extension of the anchoring pin or stud beyond the Wall of the case to engage the facing of the tooth, the advantage in the use of said openings being at the filling of the cavity of the case with the denture material will serve to form the keys in said openings Without special attention upon the part of the operator.

Having thus described my invention, what I claim is 1. An artificial tooth having a facing provided With a transversely under cut seat, and a rearvvardly open box like case slidingly fitted in said seat for the reception of a cement key, and a rearwardly extending anchoring pin or stud extended through one Wall of said case. 7

2. An artificial tooth having a facing provided with a cross sectionally under cut seat in its posterior side, a case fitted slidingly in said seat and provided in its front Wall with a perforation registering with a socket in the facing, and an anchoring pin or stud engaging said registering perforation and socket and having a headed terminal eXtended beyond the plane of the posterior surface of the facing. V o

3. An artificial tooth having a facing provided With a transversely undercut seat, and cement receiving openlngs, a rearwardly open box like slidably fitted in said seat and having openings registering With the openings of the facing, and a rear- Wardly extending anchorlng pin or stud ex- 7 cement key, and a rearivardly extended an choring pin or stud extended through one Wall of said case.

5. An artificial tooth having a facing provided with transversely undercut seat, a rearwardly open box like case slidably fitting said and a reariverdly extended anchoring pin or stud extended through one Wall of said case. V

In testimony whereof l afiix my signature in presence of two Witnesses. 7 p

FREDERICK W; SHAPLEY.

"Witnesses:

' H. Coon'rnn,

WILLIAM S. RINEHARTh 

